Power injector



FIG. 1 is a front perspective view of a power injector of our new design;

FIG. 2 is a right view thereof;

FIG. 3 is a left view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a front view thereof; and,

FIG. 7 is a rear view thereof.

The broken lines in the drawings are included for the purpose of illustrating environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for a power injector, as shown and described. 